By your own methodology (see here for some data (http://www.aei.org/files/2012/01/20/-attitudes-about-abortion-39-years-of-polling_131350993384.pdf)), we can properly describe a platform that seems to be against any form of legal abortion as "extreme."

I don't know that opposing public funding to groups that advocate or perform abortions is "extreme," but certainly Republicans have taken "extreme" positions on opposing such groups, including by imposing regulations that make it so burdensome to operate as to be practically impossible (potentially amounting to a violation of the Takings Clause).